Ultra-Low Power PMIC with 3-Output SIMO, Power Path Charger Optimized for Small Li+, 425mA Current Sink, and 8 GPIOs

Ultra-Low Power PMIC with 3-Output SIMO, Power Path Charger Optimized for Small Li+, 425mA Current Sink, and 8 GPIOs

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The MAX77278 provides a highly-integrated battery charging and power supply solution for low-power applications where size and efficiency are critical.The device features a single-inductor multiple-output (SIMO) buck-boost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size. A 50mA LDO provides ripple rejection for audio and other noise-sensitive applications. A highly-configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA).

The device includes other features such as a programmable current sink that can be used to drive an IR-LED, 8 general-purpose input/output (GPIO) control pins, and an analog multiplex (AMUX) output that provides access to useful battery charging signals. A bidirectional I2C interface allows for configuring and checking the status of the device. An internal on/off controller provides a controlled startup sequence for the regulators and provides supervisory functionality when the device is on. Numerous factory programmable options allow the device to be tailored for many applications, enabling faster time to market.

Design Solution: Choose a Tailored SIMO PMIC for Your Portable Design ›

MAX77278:Simplified Application Circuit MAX77278: Simplified Application Circuit Enlarge+

Key Features

  • Highly Integrated
    • Smart Power Selector™ Li+/Li-Poly Charger
    • Three Output, SIMO Buck-Boost Regulator
    • 50mA LDO with SIMO Fixed Headroom Control
    • Programmable 250mA to 425mA Current Sink Driver
    • Analog MUX Output for Power Monitoring
    • Eight GPIOs (Configured for One-Button Wake-Up and Two-Button Shutdown)
  • Low Power
    • 0.3µA Standby Current
    • 16µA Operating Current
  • Charger Optimized for Small Battery Size
    • Programmable Fast-Charge Current from 7.5mA to 300mA
    • Programmable Battery Regulation Voltage from 3.6V to 4.6V
    • Programmable Termination Current from 0.375mA to 45mA
    • JEITA Battery Temperature Monitors Adjust Charge Current and Battery Regulation Voltage for Safe Charging
  • Flexible and Configurable
    • I2C-Compatible Interface
    • Eight GPIOs
    • Factory OTP Options Available
  • Small Size
    • 3.15mm x 2.15mm x 0.7mm
    • 35-Bump, 0.4mm-Pitch, 7x5 Ball Array, WLP
    • Small Total Solution Size (24mm2)


  • Internet of Things (IoT) Gadgets
  • Remote Controls, Game Pads, Media Center Controllers
  • Smart Home Automation Pads, Thermostats, Battery-Powered User Interfaces
  • Wearables, Fitness and Health Monitors

See parametric specs for Battery Chargers (75)

Part NumberCharging VIN
Cell Chemistry# Lithium Ion Cells
MAX77278 7.250.475

See parametric specs for Multifunction PMICs (83)

Part NumberVIN
# Step-Down Outputs# LDO OutputsBattery Charger Features
MAX77278 2.85.531
Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX77278EVKIT: Evaluation Kit for the MAX77278
Request Reliability Report for: MAX77278 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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